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Using color keys

The actor footage has been filmed against a blue screen. Because you want to superimpose the actor against the feed-store background in the final composition, you will key out the blue screen background.

The most common example of this procedure is your local news show. The weathercaster stands in front of a bright-blue screen. The image is picked up by the camera, but before it is broadcast, a keying process makes the blue screen transparent, allowing a computer-generated weather map to show through.


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